The third harmonic is the one you get from the string vibrating in thirds. Its frequency is three times the fundamental frequency. Since your C string’s fundamental is 1 Hz, the third harmonic has a frequency of 3 Hz, and it produces a note called G. The interval between C and G is called a perfect fifth, for reasons having nothing to do with harmonics. I know it’s confusing.
a constructor with implementation (user-defined constructor)
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Derivation tree: visual DAG of all reduction paths, with branch/merge tracking
——容易委员（中国航天科技集团有限公司一院长征二号F运载火箭总设计师）
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